Gerard Pique - Manchester United to Barcelona, 2008

A product of the Barcelona academy, Gerard Pique joined Manchester United in 2004, but after his lack of progression at Old Trafford, he returned to Spain four years later.

Under the tutelage of Pep Guardiola and now Tito Vilanova, the Spain international has gone on to establish himself as one of the best defenders in all of Europe, leaving Sir Alex Ferguson scratching his head, to wonder what might have been. 

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